Ground plane effect on the performance of a printed Minkowski monopole antenna (original) (raw)

Reduction of Ground-Plane-Dependent Effects on Microstrip-Fed Printed Rectangular Monopoles

Iet Microwaves Antennas & Propagation, 2008

Methods to mitigate the strong dependence of impedance bandwidth on the groundplane size for a rectangular printed planar monopole is described. It is shown that the bandwidth limitation may be overcome by introducing feed-line asymmetry, which alters the purity and the Q of the higher frequency modes and by ground-plane augmentation, which effects the lower frequency modes. A method of extending the ground plane without increasing the overall antenna size is shown to improve both the bandwidth and gain and also to enable the use of significantly smaller ground planes. The effects of these techniques on radiation pattern are discussed.

Single and multi element printed Minkowski monopole antennas for portable terminal devices

Automatika, 2004

In this paper a printed fractal Minkowski monopole is presented for use in wireless terminal devices utilizing single and multi element antenna systems. In the case of a single element system the effect of the antenna's placement with respect to the ground plane is examined and a method to fine tune the system in its worst case situation is proposed. The influence of the ground plane dimensions on the system's impedance and radiation characteristics is also investigated and general conclusions are drawn. Subsequently, a four element antenna system for diversity applications is investigated. The diversity performance is evaluated by means of the envelope correlation coefficient, the mean effective gain and the effective diversity gain. The impact of the mutual coupling on the system's performance is also addressed.

Analysis of the Effects of Rectangular Ground Plane on Radiation Pattern of the Monopole Antenna

The aim of this paper was to analyze the impact of rectangular plane ground on the radiations pattern of the monopole antenna. Several simulations have been performed where the monopole antenna with wavelength 4m was placed on top of the rectangular plane ground and then radiations pattern was obtained in terms of directivity, electric field and gain, and finally the results were analyzed and concluded that large the ground plane is, the lower the direction of maximum radiation and as the ground plane approaches infinite size, the radiation pattern approaches a maximum in the x-y plane.

Reducing Ground-Plane Effects on UWB Monopole Antennas

IEEE Antennas and Wireless Propagation Letters, 2011

A common problem with planar ultrawideband (UWB) monopole antennas is that their performance is heavily affected by the ground plane. To resolve this problem, a novel approach is proposed in this letter. Slots along the top edge of the ground are introduced to minimize the ground-plane effects by changing the current distribution. An equivalent circuit model is developed to obtain an insight view of the behavior of the slots. Computer simulation and measured results are obtained, and they confirm the validity of the proposed method.

Input impedance of a monopole antenna at the center of a finite ground plane

IEEE Transactions on Antennas and Propagation, 1978

A technique for computing the input impedance of a monopole on a finite ground plane is provided. The case of an infinite ground plane is first examined, and then the concept of using a magnetic edge current as an equivalent source of diffraction on the limited size ground plane is introduced. The technique used is self-consistent in that the circular ground plane considered is the limit of a palygonal ground plane as the number of sides tends to infinity. Good agreement has been demonstrated when the nearest edge of the ground plane is at least.0.3 wavelength from the base of the monopole.

Design and development of wide band printed monopole antennas for airborne applications

2019

Major challenges faced by airborne VHF monopole antennas are to achieve wideband characteristics in permissible antenna height and to find the apt location for mounting, so as to satisfy sufficient ground plane around its feed point. The increased applications of electromagnetic spectrum result in a large number of antennas competing in the limited space available on platform. The deficient ground plane can deteriorate the radiation characteristics of antenna. Printed monopole antennas can overcome this deficiency, as the ground plane of these antennas are implemented in the same plane of that of the radiating element. Hence, the present work deals with the development and analysis of two novel wideband printed monopole antennas in VHF band for mounting on airborne platforms. The radiation characteristics of these antennas were evaluated for free standing condition and also for mounted on standard ground plane condition. The performance of the presented printed monopole antennas are...

Highly compact UWB printed monopole antennas with different ground plane structures

Microwave and Optical Technology Letters, 2013

This article presents highly compact-sized, low-profile, and planar monopole antennas for ultra-wideband (UWB) operations. The two proposed antennas' structures consist of the circular radiating patch with microstrip-fed monopole structure and coplanar waveguidefed (CPW) monopole structure. By properly selecting positions and dimensions of the embedded slots in the radiating patch and ground planes, wide impedance bandwidths are achieved. The numerical and experimental results show that the designed antennas can operate over UWB band groups 2, 3, 4, and 5 and satellite communications. The designed antennas have the simple uniplanar structures and occupy small size of 11 Â 16 mm 2 including the finite ground CPW feeding mechanism and partial ground microstrip line feeding mechanism. In addition, acceptable radiation characteristics are obtained over the operating bands.

Monopole Antenna Performance at Varied Feed Positions

FUDMA JOURNAL OF SCIENCES - ISSN: 2616-1370, 2018

ABSTRACT Two simple monopole antennas mounted on finite ground planes are presented. The antennas designed to operate at 900 MHz and 1800 MHz respectively are simulated using High Frequency Structural Simulator (HFSS). The study reveals that variation in feed position from the edge of width of ground plane leads to slight increase in resonance frequency and return loss but decrease in antenna gain. An enhancement in gain can be achieved (up to 5% and 40 % for antennas tuned at 900 MHz and 1800 MHz respectively) when the feed is placed at the edge of the ground plane. On the other hand, an increase in bandwidth of 33.3% and 4% was observed when the feed is positioned at the center of the width of ground plane for 900MHz and 1800MHz tuned antennas respectively. Therefore for optimal monopole antenna performance, the choice of feed position should be made based on the application of interest.

Analysis of High Impedance Surface as Ground of Monopole Antenna for Bandwidth Enhancement

Proceedings of the 3rd International Conference on Electric and Electronics, 2013

Monopole antenna is one of the famous low-profile antennas because of its features of light in weight and easy to install. However, it can only be operated in lower gain and bandwidth due to the easiness of noise affecting. As other types of antenna, monopole antenna uses perfectly electrical conducting plane (PEC) as its ground plane which are made by a printed circuit board (PCB). PCB is well-known with its disadvantages in terms of bandwidth, loss, and gain. Thus, in order to enhance the performance of a monopole antenna, it is good if the radiation's part is undisturbed in order to maintain the antenna's features, while only at the ground is focused. In this project, a structure with arrays of protrusions instead of flat plate that is commonly used on most ground plane will be developed. This structure is called as High Impedance Surface (HIS) ground plane. It has been proved that a corrugated metal surface (protrusions) where the corrugations are folded up into lumped-circuit elements can have high impedance value on the surface. HIS is believed to eliminate the surface waves which reduce the power radiation as well as the efficiency. Therefore, the bandwidth frequency can be enhanced and antenna's performance can be improved. In this report, some specifications such as length of antenna, width, and others required parameters are shown. These parameters are used to remodel the ground plane of the antenna according to the desired one where it can operate in lower frequency but still can perform well in term of higher bandwidth and efficiency of transmission.

Technique for minimising the effects of ground plane on planar ultra-wideband monopole antennas

IET Microwaves, Antennas & Propagation, 2012

A common problem with current planar ultra-wideband (UWB) monopole antennas is that their performance is heavily affected by the size of the ground plane. This is due to the fact that dimensional changes influence the characteristic modes excited on the ground plane, which directly affects the impedance and the radiation behaviour of the antenna. A technique of cutting slots on the ground plane is proposed to solve this problem. Owing to the presence of slots, the slot modes will be introduced. The optimal dimensions of the slots can produce strong coupling between the slot modes and the ground plane modes. This coupling makes the characteristic modes of planar UWB monopole insensitive to the changes in the size of the ground plane, hence effectively minimising the dependence of the antenna on the dimensions of the ground plane. Furthermore, a parametric study on the major geometric parameters of the slots is given to achieve an optimised design. Using this technique, two different UWB monopole antennas are investigated to observe the effectiveness. Both simulated and measured results demonstrate that this method can minimise the effects of dimensions of the ground plane on the impedance matching with very little effect on the other antenna parameters, such as radiation pattern, gain and time-domain performance.